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Thread: Converting the throttle linkage from Synchronized to Progressive.

  1. #11

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    Interesting thanks, is there a potential fuel economy benefit involved also? Do you feel 30% for transition is a good across the board number, or just what works for you particularly?

  2. #12
    Join Date
    Nov 2014
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    Ont. Canada
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    1,682

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    Turn your key-on/engine-off, then open your throttle until your secondary link is tight. Then look at the TPS setting and use that number.

  3. #13

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    Changed one car to a progressive link this weekend. We would up it at 41%, changed nothing else in the tune and it seems to be working quite well.

  4. #14

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    There are no direct fuel savings benefits from switching to progressive linkage. It’s primary benefit improved driveability. In theory, by avoiding the “jackrabbit” starts that are common with 1:1 linkage, you COULD save some fuel. However, that's more of a function of your driving style. With progressive linkage, the primary throttle blade is the ONLY one that opens when you first press the accelerator pedal. But, after 30° of travel, the secondary blade starts opening at a faster rate, so they both reach 100% at the same time. The 30° that you enter into the System setup for progressive operation is simply letting the ECU know the opening rate is not going to be linear (as with 1:1 linkage); it will be “progressive”, slow initially and then fast.

  5. #15
    Join Date
    Oct 2016
    Location
    Buenos Aires, Argentina.
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    72

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    Hello. Yesterday read this post and today checked my linkage. My the secondary start open at 24% of TPI. Tomorrow change to 'progressive' and '24%' blend and try.
    Does switching from 1: 1 to progressive involve modifying the AE curves vs. TPS Rate of Change, AE TPS vs. Coolant Temp & AE Correction vs. TPS? My curves:
    Attachment 3151 Attachment 3152 Attachment 3153

  6. #16

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    The simple answer is No. I made no changes to these tables. I simply went back into the Wizard (on the Touchscreen) and selected Progressive instead of Synchronous. I even used the default 30% value for the opening point. (The Help said 30% was typical for a Holley throttle body.) I then simply saved the change. If the Wizard made any changes to those tables, I didn't see it. The car started immediately and drove much more smoothly right away.

    Follow-Up: I just looked at my latest Global File and, to the naked eye, the tables look identical to the ones you posted. (Truthfully, I had to look around to find them. I haven't had a need to modify them.)
    Last edited by 347Capri; 05-21-2018 at 10:53 PM. Reason: Follow-up

  7. #17

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    I'd just like to take a moment to thank the OP for this thread. I just bought the Holley 20-122 kit from Summit to install on my Terminator Stealth.

    After a couple years since this thread was made, can anyone recommend a specific TPS % to adjust the secondaries to start opening at? I have a T-56 Magnum and I'm looking for optimal street cruising in town with all of the city stop lights.

    Like does anyone recommend 20%, 25%, 30%, 35%? Just as a starting point of course for me to dial it in from. I'd like to be in the ballpark to start out with. Thanks!

  8. #18
    Join Date
    Dec 2009
    Location
    Connecticut
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    26,759

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    It's not a choice. It's whatever progressive linkage adjustment that brings the secondary throttle blades to WOT simultaneously with the primary throttle blades.

  9. #19

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    Ah, I see. So I go WOT and adjust the rod until the secondaries are 100%, THEN see what TPS% the secondaries start to open at and just use that %. Thanks!

  10. #20
    Join Date
    Dec 2009
    Location
    Connecticut
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    Correct, because you probably don't want to mess around with drilling new secondary linkage position holes.

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